Wang Bangwen1,2,Yang Qinke1,3,Liu Zhihong1,2,Meng Qingxiang3
1.Institute of Soil and Water Conservation,Chinese Academic of Sciences and Ministry of Water Resources,712100,Yangling,Shaanxi;2.Graduate School of CAS,100039,Beijing;3.College of Resources and Environment,Northwest Sci-Tech University of A & Forestry,712100,Yangling,Shaanxi: China